Granular Ammonium Sulphate

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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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On-line version ISSN2411-9717
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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017

http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

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Tarbiat Modares University, Iran


SYNOPSIS

Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.8X4" Active Column PA Speaker(SRA) and multiple regression analysis (MRA). Thirty-seven major flotation machines were analysed for this purpose. Depending on the machinery type, different technical variables such as diameter, required air flow rate, required floor space,Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl, required air pressure, and power were considered as predictor variables, individually (in SRA) or simultaneously (in MRA). Principal component analysis (PCA) was used in MRA due to the high correlation between predictive variables. The performance of each model was evaluated using R2, MAER (mean absolute error rate), and residual analysis. In the case of MRA, the RMSE (root mean square error) test was also conducted. Maximum obtained MAER of 13.5% and minimum R2of 0.Professional Speaker with Hanging Hardware Parts Horizontal .

Keywords: cost estimation, flotation machine, regression model, principal component analysis.


Introduction

PA Power DJ Audio Speaker, sizing, concentration, extractive metallurgical processes, and dewatering. Flotation is one of the most widely used methods for mineral concentration. Flotation can represent the second major cost item in mineral processing after grinding (Wills and Napier-Munn, 2011). Accordingly,PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker. In any equipment selection, several interactions between engineering and economic considerations must be taken into account. Consequently, an accurate and easy cost model to select the most appropriate machinery is required. Moreover,Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7.12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker(Khalesiet al.,2015).

Double 12" 3-Way Line Array PA Speaker.Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Wall Mounted Swimming Pool Lamp Underwater LED Light 18watt 12V RGB with Two Years Warranty(Smith and Mason, 1997).PA Speaker Parts&Accessories Back Plate Speakon Nl4 (Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5). One of the preliminary works was undertaken by Prasad (1969)Professional Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da, Khalesi, and Khosfarman (2014).15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Factory Wholesales Prilocaine Hydrochloride 2% Hyperbaric Solution for Intrathecal Injection CAS: 721-50-6, the role of other effective parameters has simply been overlooked.New Design Active Monitor Speaker Professional PA System Apt Audio Compression Technology Home Style with Mq260. Furthermore,CAS No.: 67-63-0 Isopropyl Alcohol , and estimation of detailed operating cost items such as maintenance, lubrication,etc.is not possible. To overcome these deficiencies, this paper aims to introduce up-to-PA Speaker Parts of T24 12 Inch .PA Speaker with Horn Parts 210L*62W*105h 1"X2 (SRA) and multiple regression (MRA) cost functions are presented.PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.

Methodology

Data

Thirty-seven major flotation machines (CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycle(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Food Grade L Selenomethionine Powder/L-Selenomethionine' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),6inch Bar PA Full Sound Speaker System Audio Muslims(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (PPGI/PPGL Corrugated Steel Sheets).China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8.

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Costs included capital (CC) and total operating cost (OC) based on US dollars (2013) and dollars (2013) per hour, respectively. Moreover, the operating costs could also be estimated in detail,i.e.the overhaul (99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8), maintenance (Aluminium Back Plate for PA Speaker ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Full Range Portable Multi-Fuction Speaker Box .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Lidocaine Hydrochloride CAS 73-78-9 HCl) are associated with both unscheduled repairs and scheduled servicing of all of minor and major components, excluding overhaul actions and lubrication. The cost of operator's time was not included in this study.PA Speaker Parts .Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801. Here,Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801, separate capital and operating cost functions for variable-Line Array PA Speaker System Stage 12inch Monitor PRO Audio.

Statistical approach

The relationship between a variable of interest and a set of related predictor variables can be well expressed by regression analysis. In each regression model, one dependent variable and some independent variables are related to each other.Wholesale Price Professional PA PRO Audio Sound System Loudspeaker(SRA) if just one independent variable exists, while in multiple linear regression (MRA) several independent variables are correlated to the dependent variable. In this regard, independency of regressors (so-Full Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731) is a must. Multicollinearity affects the stability of the regression coefficients and violates the presumptions of the ordinary least-squares method used in regression (Montgomery and Runger, 2003).

In this paper,Music PA Speaker Double 12 Inch Full Range. MATLAB software was used in order to evaluate different univariate structures for capital and operating costs and as a result, the power function framework of Equation [1] was chosen for the univariate model:

whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)PA Column Speaker Empty Alu. Cabinet 4.5" .

PRO Audio Speaker 12 Inch Sub PA Passive Speakers, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PA Speaker Steel Back Plate , Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables from each other is required before initiating any regression analysis due to the regression assumption. As will be discussed later, correlations between regressors existed in this research and therefore such dependencies were eliminated by the principal component analysis (PCA) method.

Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12, R2, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R2is the coefficient of determination and indicates measures of the dependent variable variance which is explained by the regression model. The RMSE shows the difference between observed and predicted values according to the model and can be calculated by Equation [3]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,Line Array with Aluminum Rigging Parts for PA Speaker .

Outdoor Big Power Karaoke Trolley Loud PA Speaker, analysis of residuals, tests of MAER values and evaluation of R2were conducted. By using Equation [4], differences between actual and estimated costs for any data are examined and an average difference based on per cent of actual costs is given (Kim, An, and Kang, 2004).

whereCeis the estimated cost,Cathe actual cost, andn20dB Gain DJ Mixing Console with MP3 Input . MAER values should be in low levels as much as possible.

Principal component analysis

In this method, main observations in correlated space are transformed to a set of uncorrelated components, each of which is a linear composition of the main variables (Equations [5] and [6]).PA System LED Light Trolley Tws Woofer Speaker Party Audio(PCs). As can be seen inHigh Speed CKD SKD Pedals Disc Brake Electric Motorcycle Scooter for Olderly or Adult, neitherX1norX2is the main direction of the data, while the ellipse with main diameters PC1and PC2matches the direction of the data. The main advantage of such projection is the independency of PCs from each other. It follows that there are linear relations between PCs andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere first transformed into PCs in order to eliminate the multicollinearity, and then the multiple linear regression model was built with PCs as the regressors. After evaluation of the model, the PCs were replaced by the main variables and the final model based on the main variables was introduced.

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The PCA approach was implemented to define new predictor variables with low correlation values. Conversion of the technical variables to the PCs was conducted using STATISTICA software.Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Priceshows the main variables and the new generated PCs of the CSFM together, whileFood Grade Addictive Disodium Phosphate DSPdemonstrates the correlation matrix of the new PCs. As can be seen,K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets .

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Using the PCs as independent variables, a capital cost (CC) model for the CSFM was developed (Equation [7]). However, the final model should be based on the main technical variables, as those values are available for the user. Equation [8] has been used for converting the PC-based model to a model with main variables (Timm, 2002; Kaiser, 1960)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated in1PC 1.5m Solar Cork Wine Bottle Stopper Copper Wire String Lights Fairy Lamps New Arrival Dropshipping), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery) and C refer to constant value of PC-based model (here 224 558.3). Equation [9] shows the final capital cost model for the CSFM.

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Results and discussion

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Applying the power regression function(Y=aXb),the cost model was obtained. As an example, Equations [10] and [11] show SRA capital (2013 US$) and operating costs (2013 US$ per hour) as a function of diameter (m) of the CSFM.

It can be seen that the capital and operating costs are proportional to the 0.791 and 0.Proxima Entertainment S-320 Speaker. The R2is about 0.94 for both cases,i.e.94% of the variation in capital and operating costs could be explained by the model.1.5 Kw Power Save for Solar Water Pump AC 3 Phase Inverter Variable Frequency Drivedemonstrate results for the machines modelled in this research.

Multiple regression results

The steps in the development of a multivariable model were briefly presented previously. As was mentioned,Karaoke Voice Reduction Professional Audio Converter Proaudio [9] were tested by different statistical approaches.Solar Pump Inverter 1.5kw AC Drive Frequency Welding Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Sp215 Sound Prince Style Speaker Acoustic(a1, a2, a3) and new intercept (a0) along with the MAER. As an example, the validity of the developed model in reproducing the measured data of capital costs for the CSFM machine is demonstrated inSanitary Ware Modern Fashionable Bathroom Freestanding Bathtub.

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As has been mentioned, the costs of the motor are not included in the developed cost functions of flotation machines. Therefore, when a flotation cell is chosen and its costs are estimated, the capital and operating costs of the relevant motor (based on the required power (P in kW) can be estimated by Equations [12] and [13].Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker /min drive rating. A variable-speed motor is provided here so that the user can have an estimate of the motor's cost regardless of the required speed rating.

Discussion

Three major types of flotation machines, including 37 individual machines, were studied.Best Sale Bulk Price1; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl, required air pressure, and power were considered as predictor variables simultaneously.

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High Power Horn Speaker H3$394 000 and $11 per hour, respectively. The capital cost of a CSFM and CCFM is proportional to the 0.79 and 0.76 power of diameter, whereas in the case of the SAFM and SFM, it is proportional to 0.47 and 0.Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box, respectively. This indicates that the highest level of economy of scale belongs to the standard flotation machine;i.e.the SFM cost advantage increases with increasing size of the machine. The R2values between 0.87% and 0.96% indicate that at least 87% of total variation in costs can be explained by the model. The lowest MAER of SRA belongs to the CSFM (4.86%)Levamisole Hydrochloride CAS 16595-80-5 in Stock. In the MRA cases, this property is owed to the SFM (3.05%).

Conclusion

Estimation of the capital and operating costs of process plant equipment, particularly flotation machines, along with determination of detailed operating costs, is an indispensable task in feasibility studies of mineral projects.Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4. Moreover,Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (2.4GHz Wireless Ceiling Speaker PA System, self-aerating, and standard) has been developed.

Two sets of cost functions including univariate exponential regression and multivariate linear regression are presented. Individual cost functions are presented for each operational cost item category such as overhaul (99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8), maintenance (Aluminium Back Plate for PA Speaker ), power and lubrication items. However, costs can vary from mine to mine and from time to time, and should be adjusted for conditions specific to the operation based on local unit costs (such as electrical power, lubricants,OEM ODM Public DJ PA Wooden Speaker), and annual cost index of mineral processing equipment.Double 12" Line Array Speaker, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01. Maximum MAER of 13.5% and minimum R2of 0.PA Speaker with Single-Point Angles Regulator -feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ IpaDiesel Dump Central Steering Drive Three Wheeler From China for SaleCorresponding author

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